"It's a real downer but we've got all these people, we love each other and we need to get back strong."

Security is set to be increased at Bramall Lane on Saturday night, where Brook defends his world title against Spence.

Kell Brook during a public workout at the Peace Gardens (Image: Getty Images Europe)

Kell Brook is put through his paces (Image: REUTERS)

Errol Spence during a public workout (Image: Getty Images Europe)

Ahead of the bout, Brook added: "He's a young, hungry lion but he's not been in with anyone like me - I'm the champion, I've been the challenger; I've gone to the champion's back garden and took the title away. I've defended it.

"I know what it's like on both sides. I've prepared very well, we've put ourselves through hell and I'm ready for a war. That's what you're going to see, a war.

"I'm Sheffield born and bred and these are all the crew - got all my people here they're behind me 100 per cent. We're going to rock Sheffield Saturday night."